The How I Met Your Mother actor has penned three books based on a script he sold when he was 21, which he managed to buy back when he became famous.

According to VH1, Segel said he "sold the script for super cheap because I didn't know any better back then.

"As I got more successful I kept hoping they wouldn't know I was the same Jason Segel as the Jason Segel they bought the script from."

While Segel, 33, wouldn't give away too many details on the book series, he did say: "It's about kids facing their biggest fears, that's about all I can tell you."

In February Michelle Williams, 32, dumped Jason over concerns about their long distance relationship.

A source said: "She cares a great deal for Jason but is not ready to make a commitment.

"Maybe if they were together day-to-day, she would have more confidence in a future. But not at this time."

Segel is based in Los Angeles for his TV show while Williams lives in New York with her seven-year-old daughter Matilda and the commute eventually became too much for the pair.

A second source added: "Jason never got rid of his place in LA, and Michelle's life with Matilda was and has always been in New York. While Jason made every effort to make them a priority in his life - and they were top priority - he still couldn't drop everything and leave his life and career in LA."